Captain O-Ring HPA / CO2 Burst Disk 3k / 3000 psi - 2 Pack (Compressed Air Paintball) [Bonus CO Microfiber Cloth] 3k burst disk (2 burst disks included) Used on CO2 tanks as the safety burst disk Includes a bonus Captain O-Ring Microfiber Cloth! Manufactured and warrantied by Captain O-Ring LLC